First Name: Ethan

Last Name: Unknown (Will be revealed later in the story)

Looks:

(Imagine he is wearing a red hat with a white Poké ball on it, black and red shoes, and a red vest)

Items:

Mega Bracelet 

Z-Ring

Dynamax Band

Terastal Orb

Team: (I will allow him to carry 10 Pokemon but use 6 in gyms)

Fuecoco

Ceruledge/Armarouge

Zeraora

Gardevoir 

Dialga (He will also have his Origin form which I still think is the best... Fight Me.)

Giritina

Aegislash

Charizard

Lucario